A method for improving the negative electrode performance of lithium-ion batteries

A lithium-ion battery and negative electrode technology, applied in the field of electrochemistry, can solve the problems of low initial charge and discharge efficiency of the battery, unresolved lithium salt loss, and unfavorable practical application, so as to improve cycle performance and capacity retention rate, and improve electrochemical performance. Stability, the effect of improving storage performance

Active Publication Date: 2021-06-08
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is complicated to operate and increases the cost, and the formation process does not solve the problem of lithium salt loss, which is not conducive to practical application
There are other patents such as CN103151565A, CN106953127A, etc., which have not fundamentally solved the problem of lithium salt loss, which will reduce the low efficiency of the battery for the first time.

Method used

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  • A method for improving the negative electrode performance of lithium-ion batteries
  • A method for improving the negative electrode performance of lithium-ion batteries
  • A method for improving the negative electrode performance of lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 80 μL of 1-fluorodecane in 5 ml of anhydrous cyclohexane, perform ultrasonication for 5 mins, apply 5 mL of the solution on the negative electrode sheet (carbon-based negative electrode) with a spatula at a height of 100 μm, and drop the electrolyte solution to completely cover the entire surface On the surface of the pole piece, cover the surface with a clean lithium foil, apply a pressure of 4MPa, and pre-fill lithium for 4mins. The pole piece is washed by the solvent DMC, and then dried at 60°C. The negative electrode sheet was punched into an electrode sheet with a diameter of 15 mm, and the corresponding positive electrode sheet was matched to prepare a button-type full battery for electrochemical testing.

Embodiment 2

[0033] The prepared negative electrode sheet was cut into a 7 cm original sheet, and fixed on the table of the spin coater, and the spin coater was started at a rotational speed of 500 r / min. Dissolve 80 μL of 1-fluorohexane in 5 mL of anhydrous cyclopentane, and sonicate for 5 mins. Aspirate 1 ml of the solution through a pipette gun, and slowly drop it onto the center of the negative electrode sheet (titanium-based negative electrode) for spin coating. The electrolyte solution was dropped on the surface of the negative electrode and completely covered the entire surface of the electrode, and a clean lithium foil was covered on the surface, and the pressure was 0.5 MPa, and the lithium was pre-filled for 60 minutes. The pole piece is washed by the solvent DMC, and then dried at 60°C. The negative electrode sheet was punched into an electrode sheet with a diameter of 15 mm, and the corresponding positive electrode sheet was matched to prepare a button-type full battery for el...

Embodiment 3

[0035] Dissolve 800 μL of 1-fluorobutane in 50 mL of anhydrous cycloheptane, and sonicate for 5 mins. Take 20mL of the solution and put it into a spraying machine, and spray it at a certain rate against the negative electrode sheet (silicon-based negative electrode) with a side length of 10cm until the solution is sprayed, then drop the electrolyte on the surface of the negative electrode sheet and completely cover the entire surface of the electrode sheet , cover the surface with a clean lithium foil, and apply a pressure of 25MPa, and pre-supplement lithium for 1min. The pole piece is washed by the solvent DMC, and then dried at 60°C. The negative electrode sheet was punched into an electrode sheet with a diameter of 15 mm, and the corresponding positive electrode sheet was matched to prepare a button-type full battery for electrochemical testing.

[0036] In this embodiment, the negative electrode sheet can also be a tin-based negative electrode; the organic solvent can al...

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Abstract

The invention discloses a method for improving the performance of the negative pole of a lithium-ion battery. Firstly, fluorinated alkanes are dissolved in a volatile organic solvent, and then ultrasonic treatment is performed to form a uniform solution; secondly, the obtained solution is evenly coated on the surface of the negative plate. ; Add electrolyte solution to the surface of gained negative electrode sheet at last, and cover a lithium sheet on the surface of negative electrode sheet, pressurize on lithium sheet, make lithium sheet and negative electrode sheet fully contact, carry out pre-filling by the potential difference between negative electrode sheet and lithium sheet lithium, and at the same time promote the formation of a layer of SEI film on the surface of the negative electrode, and then wash and dry the excess electrolyte to obtain the final negative electrode. The invention has simple operation and can effectively improve the electrochemical stability of the battery.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a method for improving the performance of a negative electrode of a lithium ion battery. Background technique [0002] Lithium-ion battery is a portable and environmentally friendly battery with high voltage, high energy density, long cycle life, and good safety performance. It has been widely used in portable electronic devices such as mobile phones, video recorders, and tablet computers. got some application. However, with the miniaturization of portable electronic equipment, and the development and application of high-power equipment such as electric vehicles (EV) and hybrid electric vehicles (HEV), people have required high-capacity lithium-ion batteries as power systems. and high power characteristics. [0003] Usually, during the first charging and discharging process of a lithium-ion battery, the electrode material and the electrolyte react at the solid-liquid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/36H01M4/583H01M4/60H01M10/0525
CPCY02E60/10
Inventor 邵乐沈超郑勇谢科予田占元顾金镭吴昊李健胡朝文沈晓辉寇亮袁丽只白杨芝冯皓
Owner SHAANXI COAL & CHEM TECH INST
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